Silencer for motor vehicles



Aug. 24, 1926.

' i .0. KUWERTZ ET AL SILENCERFOR MOTOR VEHICLES Filed June 16, 1925 InV'lll01l5' itt? W Patented Aug. 24, 1926.

' UNITED STATES PATENT OFFICE.

OTTO KUWERTZ, WALTER KUWERTZ, AND JOSEF KOHLHAAS, OF VOHWINKEL, GER-MANY; SAID KOHLHAAS ASSIGNOR TO SAID OTTO KUWERTZ AND SAID WALTERKUWEBTZ.

SILENCER FOR MOTOR VEHICLES.

This invention relates to silencers for mo tor vehicles, which alsoregulate the temperature or maintain the cooling of the engme.

The silencers hitherto used present the disadvantage that the ases inthe silencer are throttled to a consi erable extent. Owmg to theconsecutive shocks, the combustion gases cannot escape sufficientlyquickly, with a consequent reaction on the engine afi'ectmg its power.Moreover, the existing silencers quickly become sooty and have only ayery short life as the gases accumulating in them make the silencer redhot.

This invention relates to a silencer and temperature regulator whicheliminates all the disadvantages set forth above. It is made indifferent sizes according to the purpose, and may be used for anyvehicles, from the heaviest motor vehicles down to motor cycles.Moreover not only does it not interfere with the escape of the exhaustgases, but on the contrary it assists it, as these gases are stronglydrawn in by an air current and thoroughly mixed with the said currentwhich passes helically through the silencer, long before they escapeinto the atmosphere, owing to which a complete cooling of the gases isinsured. The soot is caused to settle down by the first brush and owingto the vibrations of the bristles, falls down.- Moreover the gases arecompletely atomized by the first brush, whilst they are again broken upby a second brush, and in that way again thoroughly mixed with the aircurrent. This invention insures a noiseless escape of the mixture of airand gases into the atmosphere, and particularly does away with any smellor dust. In addition, the temperature of the engine remains normal, asthe expelled gases which are drawn in by the eddying air current, cannotremain for any length of time in the exhaust of the cylinder of theengine. If the engine becomes hot on a steep rise, it will be quicklycooled again as soon as the speed increases.

A construction according to the invention is illustrated by way ofexample in the accompanying drawings in which:

Figure 1 shows the silencer in elevation,

Figure 2 in longitudinal section,

Figure 3 is a secti n on the line AB and Application filed June 16,1925. Serial N0. 37,472.

Figure 4 a side elevation looking from C.

In the drawing, a is the head which is secured by means of screws b tothe inlet branch 0 of the silencer. The head a, is pressed by means oflateral screws round the exhaust pipe. Between the head a and the inletbranch 0 is arranged a cone shaped nozzle d having a star-shaped holetherethrough. In the gas inlet branch 0 is arranged a steel wire brush6. Parallel to the inlet branch 0 extends a second conduit 7 which isconnected through a recess 9 to the branch 0. The branch 0 opens intothe air inlet branch h which is arranged in the direction of driving andprovided with four helically twisted partitions i in order to im part aneddying motion to the air. The air branch lb and the conduit f areextended by the two conduits la and Zwhich are connected by means of asmall conduit m throughout the whole of their width, and also by meansof a recess 71. Just before the escape into the atmosphere a furthersteel wire brush 0 is arranged in the conduit is. At the end, the twoconduits In and 1 open into a cone p owing to which an ejector action isimparted to the air current. In the centre is arranged a boss 9 in orderto enable the silencer to be secured at this point.

The working of the silencer is briefly as follows. The exhaust gasesenter the branch 0 and are atomized here by the steel wire brush 6, thesoot settling down at the same time. The atomized gases are conveyedthrough the branch 0 and also through the conduit f owing to theexistence of the recess 9. At the same time however, the gases arepowerfully drawn by the air current entering through the branch h andcaused to eddy by the partitions i, and are thoroughly mixed with saidair current in the conduit Z. The atomized gases escaping through theconduit f are again broken up by the brush 0 mounted in the conduit 70and thoroughly mixed with the air current and completely cooled in theconduit m and the recess n. The air and gas thus mixed, passes then intothe atmosphere through the cone p. Consequently a completely noiselessescape of the exhaust gases is insured, without any smell or soot. Thusthe exhaust is not in any way interfered with, but on the contrary, thegases are forced out by the eddy-like air current, owing to whic theengine cannot become hot and is always maintained at its full power. Thebrush 6 may be Withdrawn from time to time and the soot removed. Owingto the cone (Z arranged between the head a and the gas inlet branch (1and ha 'ing a star-shaped hole therethrough. the escaping flame cannotstrike the brush 6 directly, so that the latter is adequately protected.

What We claim as our invention and desire to secure by Letters Patentis:

1. A silencer for motor vehicles comprisin'g body iaying an air inlet atthe forward end, helical projections Within the air inlet for giving theair an eddy-like motion, an inlet branch leading into said body, aconduit parallel to said inlet branch and opening into the branch alongpart of one side and a wire brush in the inlet branch for collecting thesoot.

2. A silencer for motor vehicles comprising a body having an air inletat the forma end, helical projections Within the air inlet for givingthe air an eddy-like motion, an inlet branch leading into said body, aconduit parallel to said inlet branch and opening into the branch alongpart of one side, a Wire brush in the inletbranch, said conduit having acontinuation forming a part of said. body. a brush in the continuation,an extension of the air inlet running parallel to the continuatiomaconduit joining the continuation to the extensionysaid last-mentionedparts being further joined by a recess beneath said second mentionedbrush and a cone shaped end on the body.

3. A silencer for motor vehicles comprising a body having an air inletat the forward end. helical projections Within the air inlet for givingthe air an eddy-like motion, an inlet branch leading into said body, aconduit parallel to said inlet branch and opening into the branch alongpart of one side. a Wll'G brush in the inlet branch and a nozzle hayinga star-shaped hole therethrough for the purpose of protecting the Wirebrush from flames which occur.

In testimony whereof we have signed our names to this specification.

OTTO KUlVERTZ. VALTER KUW'ERTZ. JOSEF KOHLHA'AS.

